Company lists · Data refreshed September 2026

Top 25 24/7 call center operators worldwide

Name: 24/7 call center operators worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 1,620 companies tracked

RevenueBase identified 1,620 24/7 call center operators worldwide as of September 2026 and tracks 65,303 professional contacts across them, including 4,101 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers 24/7 call center operators worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026. Country and city lists for 24/7 call center operators follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 27, 2026 86% judged on-target in blind review

1,620Companies

65,303Contacts tracked

4,101Verified emails

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The 25 largest 24/7 call center operators worldwide

Ranked by team size

Top 25 of 1,620 24/7 call center operators worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to 24/7 call center operators: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Afni, INC	Partial evidence	Bloomington, IL, United StatesHQ checked Sep 27, 2026	10001+	5,553 contacts →
	Partial evidence “When people reach for their phones, use laptops, or grab their tablets, Afni's contact center teams are there to provide prompt and friendly help.” Source: RevenueBase Database · checked Sep 27, 2026
2	Sercom	Partial evidence	Taboão Da Serra, BrazilHQ checked Sep 27, 2026	5,001-10,000	3,785 contacts →
	Partial evidence “Founded in 1993, since the beginning Sercom has stood out in the Contact Center Services.” Source: RevenueBase Database · checked Sep 27, 2026
3	Telvista	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,122 contacts →
	Indirect evidence “Email: info@Telvista.com Telvista is a premier provider of contact solutions that drive customer loyalty and create competitive advantage for our clients.” Source: RevenueBase Database · checked Sep 27, 2026
4	Advanced Call Center Technologies, LLC	Strong evidence	Berwyn, PA, United StatesHQ checked Sep 27, 2026	5,001-10,000	2,774 contacts →
	Strong evidence “Advanced Call Center Technologies, LLC (ACT) is a premier provider of domestic (USA), near shore and far shore outsourced call center services to the financial services, mortgage…” Source: RevenueBase Database · checked Sep 27, 2026
5	Infocision Management Corporation	Partial evidence	Akron, OH, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,764 contacts →
	Partial evidence “InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Source: RevenueBase Database · checked Sep 27, 2026
6	Km2 Solutions	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 27, 2026	5,001-10,000	1,741 contacts →
	Indirect evidence “Award-winning outsourcing partner with two decades of experience operating an exclusively nearshore strategy that delivers better performance, close to home, and at a lower cost.” Source: RevenueBase Database · checked Sep 27, 2026
7	The Office Gurus	Strong evidence	St Petersburg, FL, RussiaHQ checked Sep 27, 2026	1,001-5,000	1,198 contacts →
	Strong evidence “The Office Gurus (TOG) is a global call center and business process outsource provider of customer care, telemarketing, lead generation, appointment setting, order entry, accounts…” Source: RevenueBase Database · checked Sep 27, 2026
8	Hrhnext Services Limited	Partial evidence	Hyderabad, IndiaHQ checked Sep 27, 2026	1,001-5,000	1,076 contacts →
	Partial evidence “Even the markets know that we’re the good call’!” Source: RevenueBase Database · checked Sep 27, 2026
9	Mindpearl	Partial evidence	Cape Town, South AfricaHQ checked Sep 27, 2026	1,001-5,000	1,071 contacts →
	Partial evidence “We specialise in inbound multichannel customer support across multiple verticals from our quality, strategically located centres in Fiji, South Africa and Peru and via our work…” Source: RevenueBase Database · checked Sep 27, 2026
10	Btcc Call Center	Indirect evidence	Goiânia, BrazilHQ checked Sep 27, 2026	10001+	1,058 contacts →
	Indirect evidence “Em breve uma nova página da BTCC Conexão Cliente.” Source: RevenueBase Database · checked Sep 27, 2026
11	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 27, 2026	501-1,000	883 contacts →
	Indirect evidence “If you are interested in growing your business or increasing efficiency, AnswerNet has the expertise, technology, and people to help you take your company to new heights!” Source: RevenueBase Database · checked Sep 27, 2026
12	Fastco	Partial evidence	Providencia, ChileHQ checked Sep 27, 2026	1,001-5,000	623 contacts →
	Partial evidence “Impulsamos el éxito de nuestros clientes a través de soluciones personalizadas en Contact Center y experiencia al cliente.” Source: RevenueBase Database · checked Sep 27, 2026
13	Telemercado	Partial evidence	Córdoba, ArgentinaHQ checked Sep 27, 2026	1,001-5,000	572 contacts →
	Partial evidence “Empresa dedicada a prestar servicios de Contact Center a terceros.” Source: RevenueBase Database · checked Sep 27, 2026
14	Global Contact Services GCS	Indirect evidence	Salisbury, NC, United StatesHQ checked Sep 27, 2026	501-1,000	542 contacts →
	Indirect evidence “We are customer service experts.” Source: RevenueBase Database · checked Sep 27, 2026
15	Contactus Communications	Indirect evidence	Columbus, OH, United StatesHQ checked Sep 27, 2026	1,001-5,000	515 contacts →
	Indirect evidence “ContactUs Communications is a U.S.” Source: RevenueBase Database · checked Sep 27, 2026
16	Home Agent	Indirect evidence	São Paulo, BrazilHQ checked Sep 27, 2026	201-500	474 contacts →
	Indirect evidence “A HOME AGENT S.A.” Source: RevenueBase Database · checked Sep 27, 2026
17	Advensus	Indirect evidence	Santo Domingo, Dominican RepublicHQ checked Sep 27, 2026	5,001-10,000	459 contacts →
	Indirect evidence “In 2006, Advensus embarked on its journey in the Dominican Republic, initially known as Nearshore, with a modest 100 telemarketing positions.” Source: RevenueBase Database · checked Sep 27, 2026
18	Unitono Contact Center	Partial evidence	San Fernando De Henares, SpainHQ checked Sep 27, 2026	5,001-10,000	459 contacts →
	Partial evidence “Unitono es un referente en el sector del Contact Center.” Source: RevenueBase Database · checked Sep 27, 2026
19	Supportzebra	Indirect evidence	Houston, TX, United StatesHQ checked Sep 27, 2026	1,001-5,000	454 contacts →
	Indirect evidence “SupportZebra is a business process outsourcing company based in the Philippines, with headquarters in the Houston,TX region, that specializes in: Sales & Marketing Retention \|…” Source: RevenueBase Database · checked Sep 27, 2026
20	Proper Business Solutions	Strong evidence	Cairo, EgyptHQ checked Sep 27, 2026	1,001-5,000	447 contacts →
	Strong evidence “Proper Business solutions is offering a comprehensive suite of customer care call center services, outbound and lead generation, back-office and data processing solutions to…” Source: RevenueBase Database · checked Sep 27, 2026
21	Touchstone Communications	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 27, 2026	501-1,000	393 contacts →
	Indirect evidence “Touchstone Communications was built in 2002 on the philosophy of hiring educated, motivated talent and then providing them with the best training and management to achieve our…” Source: RevenueBase Database · checked Sep 27, 2026
22	Tikshoov	Partial evidence	United StatesHQ checked Sep 27, 2026	5,001-10,000	364 contacts →
	Partial evidence “Founded in 1997 Tikshoov is the leading provider of contact center services in Israel.” Source: RevenueBase Database · checked Sep 27, 2026
23	The Connection Contact Center	Partial evidence	Bloomington, MN, United StatesHQ checked Sep 27, 2026	1,001-5,000	354 contacts →
	Partial evidence “For over 35 years, The Connection has made a name for ourselves becoming one of the top industry partners to Fortune 500 companies looking to outsource their contact center…” Source: RevenueBase Database · checked Sep 27, 2026
24	CPM International Contact Centre	Indirect evidence	Barcelona, SpainHQ checked Sep 27, 2026	1,001-5,000	352 contacts →
	Indirect evidence “We are CPM!” Source: RevenueBase Database · checked Sep 27, 2026
25	Onbrand24	Strong evidence	Iowa City, United StatesHQ checked Sep 27, 2026	1,001-5,000	346 contacts →
	Strong evidence “As a distinguished global leader in call center outsourcing, OnBrand24 takes pride in its 30-year legacy of delivering exceptional inbound and outbound call center services across…” Source: RevenueBase Database · checked Sep 27, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: 24/7 call center operators. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names 24/7 call center operators.
Partial evidence: Its own public description names part of 24/7 call center operators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name 24/7 call center operators. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,620 24/7 call center operators worldwide

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24/7 call center operators worldwide at a glance

As of Sep 27, 2026

6.3%Verified-email coverage

40.3Average contacts per company

51-200Median size (employees)

2.0%Largest-city concentration · Lahore

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

241

11-50

548

51-200

496

201-500

160

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among 24/7 call center operators, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for 24/7 call center operators are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “24/7 call center operators”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names 24/7 call center operators), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among 24/7 call center operators, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 4,101 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 27, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

24/7 call center operators by location

10 lists · largest first

Every 24/7 call center operators list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names 24/7 call center operators, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many 24/7 call center operators are there worldwide?

RevenueBase identified 1,620 24/7 call center operators worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Afni, INC, headquartered in Bloomington, tops this list with the largest team on record.

Which country has the most 24/7 call center operators?

The United States leads with 318 companies, followed by India (102) and the Philippines (50). Every 24/7 call center operators list by country and city is linked on this page.

Which city has the most 24/7 call center operators?

Lahore leads with 33 headquartered companies, followed by Rawalpindi (27) and Karachi (20).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 4,101 verified decision-maker contacts tracked across these 1,620 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.